【判断题】【消耗次数：1】
只有说话才是表白自己、说服双方的唯一有效方式
①
对
②
错
参考答案：
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相关题目
【多选题】
( )决定了有效集和无差异曲线的相切点只有一个，也就是说最优投资组合是唯一的。
①
有效集向上凸的特性
②
有效集向下凸的特性
③
无差异曲线向下凸的特性
④
无差异曲线向上凸的特性
⑤
有效集与无差异曲线同时上凸或下凸
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